Furnace.



A. R. LE(nrGl'fFl.v

FURNAOE.

APPLIGATION FILED JULY 23, 1910.

1,062,483. Patented May 2o, 1913 4 SHEETS-SHEET 1.

- A. R. LEGGETT.

, 'FURNAGR APPLICATION FILED JULY 23, 1910. 4 1 062,483 Patented May 20, 1913.

4 SHEETS-SHEET 2.

A. R. LEGGETT.

` PURNAGE. ,f PPLIGATION HLBD JULY 2s, 1910. I 1,062,483. Patented May 2o, 1913.

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PURNACB.

APVPLIOATION FILED JULY 23, 1910. 1,062,483. Patented May 20, 1913.

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ALBERT n. LEecm'r, or NIAGARA FALLS, NEW Yonx.

F'UBNACE.

Specification of Letters latent.

Patented May $0, 1913.

Application led July 23, 1910. Serial No. 573,510.

To all lwhom, it may concern.'

Be it known that I, ALBERT R. LEGGETT, a4 citizen of the United States, residing at Niagara Falls, in the county of Niagara and State of New York, have invented new and useful Improvements in Furnaces, of which the followmg is a specification.

This invention consists of a furnace, which i 4has a large area of heat radiating surfaces y ing half in vertical' transverse section taken on the plane indicated by the line 2 2 of Fig. 1. Fig. 3 is a vertical front-to-rear section, taken on the plane indicated by the line 3-3 of Fig. 2. Fig. 4 is a horizontalsection, taken on the plane indicated by the` line 4 4 of Fig. 2. Fig. 5 is a horizontal section taken on the lane indicated by the line 5-5 of Fig. 2. l ig. 6 is a-central vertical transverse section, showing a reduced size of furnace for shallow rooms or cellars. Fig. 7 is a similar view, showing a modiiied form of construction in which the air heating tubes are crossed. F' 8 is a top plan view of the inner casing ustrated in Fig. 7, showing the arrangement of the tube receiving openings in the upper tube deck -or header.

In carrying my invention into practice, I provide a furnace having outer and inner casings, the one forming a chamber for the circulation of the air to be heated and the other a chamber for the circulation of the products of combustion prior to their discharge, the heat radiated from the inner casing being taken up by the air circulating in the outer casing and Athrough a series of tubes or conductors extending through the inner casing, thereby producing a large area of heating surface to heat the air eliiciently without heating it t0 any objectionably. high deg'rl'e.

outerl .casing comprises a shell l, a

bottom 2 and a top 3, the latter being substantially of inverted W-form or gable-roof form to provide a series of surfaces for the arrangement of collars 4 to which the air conducting pipes, (not shown), leading to the various rooms or apartments are connected, the described construction enabling a comparatively large number of conducting pipes'to be connected with the furnace.

The inner casing comprises a shell 5, a bottom Gand a top 7, said casing being of relatively smaller size than the outer casing to provide within the latter a space or chamber 8 in which the air, after being artially heated, circulates before its discharge through the conducting pipes.

yThe inner casing forms a space or chamber 9 for the circulation of the products of combustion before their discharge, which chamber is wholly closed against communication with the air circulating chamber 8. The shell 5 is provided at its rear with an outlet Hue 10 for the direct discharge of the productsof combustion, which 'flue is connected by a collar 11 with a vertical smoke pipe 12 adapted for connection at its upper end with a final iue leading to the chimney. A damper 13 1s arranged in the collar or connection 11 for regulating the discharge of the products of-combustion and entirely cutting off the outlet of the same through the fille 10.

Arranged within the inner casing are op ositely disposed series of air conducting tu es 14 arranged on opposite sides of the longitudinal center of said casing said tubes being formed with substantially' central inwardly offset v or arcuately curved portions 15 to retard the upward flow of the air to a determined extent to insure of lits being heated to a desired degree. The upper ends of these tubes tit within suitable receiving openings in the wall 7 which forms an upper iiue-su porting deck or header, while the lower ends of the tubes t within suitable receiving openings in the wall 6, which forms a lower fine-supporting deck or header. f v l The lower deck or header 6 comprises a hollow casting forming an air distributing chamber 16 of a proximately oblong -rectangular form, w ich chamber is provided at its rear with air inlet tubes 17 extending to the exterior through the outer casing.

At its center' the lower header is provided als lar wall forming a combustion chamber 18 and in advance of said chamber is forme with a heat receiving chamber 19. The {irebox 20 of the furnace is arranged below the combustion chamber 18 and is suitably supported in position, said box containing afuel supportingj grate 21 of any preferred construction, ut preferably formed in the ordinary manner of ivoted grate bars adapted to be oscilla-te from a horizont-al to a vertical position for the purpose of dumping the contents of the re-box. A connecting ring or annulus 22 is arranged between the fire-box and combustion chamber, and is removably fitted in position for ready renewal when occasion requires. The firebox and combustion chamber so formed preferably taper upwardly to a slight degree to prevent the deposit of ashes within the combustion chamber and to cause any ashes which may be contained therein to slidfx downward into the {ire-box for dischar e through the grate. The fire-box 20 and as pit 23 are suitably partitioned from the space or chamber 8 and the ash-pit is of proper form to receive an ash-pan 24 normal y arran ed to catch the dropping ashes and remova le throu h an o ening 25 in the front wall of the sell 1, willich o ening is adapted to be closed by a suitab e con struction of ash-pit door 26. By this construction the parts of the furnace may be conveniently assembled and disassembled for re airs or replacement or for taking down t e furnace, as will be readily understood. Fuel is supplied to the ate through a feed mouth or passage 27 iiliised against communication with the chamber 8 and extending from the front of the outer casing to the interior of the inner casing at a point above the front of the combustion chamber. This feed mouth is ada ted to be closed by a door 28 having draft openings therein controlled by a rotarydamper 29 through which air may be admitted to combine with the smoke and gases'rising from the grate under. some conditions to facilitate their consumption. The bottom of the feed mouth is formed and closed by a downwardly and inwardly inclined air induction or feed flue 30 having a depending portion 31 which ts within the receiving opening 19 in the header 6 and opens at its lower end below said header for the sup lemental feed of air to the ash-pit an upward through the grate. This airis heated on its passage to the grate, thus preventing chilling of the grate or particles of fuel and the consequent formation of clinkers. The flue is provided at its entrance end with a pivoted door 32 having openings therein controlled by a draft slide 33, whereby the quantity of air supplied to the fire-box may be conveniently controlled.

Communicating at their upper ends with the front of the chamber 9 are vertical downdraft flues 34 connected at their lower ends with horizontal flues 35 arranged on o po site sides of the center of the base o the chamber 8 and extending intothe ash-pit. The said horizontal flues have their front ends extending to the exterior at the front of the furnace and provided with closure or clean-out caps 36 and have their rear ends connected at the rear of the furnace by a union 37 from which leads an indirect outlet flue 38 extending through the rear wall of the outer casing and communicating through a branch connection 39 with the lower end of the smoke pipe 12, the outer end of said connection belng provided with a closure or clean-out ca 40.

Whenever it is desire to retard the discharge of the products of combustion to increase their range of travel throu h the furnace and to heat the air to a hig er degree, the damper 13 inthe direct outletv branch 11 may be closed as a result of which the products will iow through the vertical downdrafts '34 t0 the horlzontal lues 35 and finally out into the smoke pipe 12. Upon the removal of the caps 36 and 40 the horizontal draft lues 35 may be cleaned of any soot deposited therein.

It will be seen from the foregoin description, taken in connection with the awings that the furnace provides a lar e area of heating surface for the effective eating of a comparatively lar e volume of air, w ich will accordingly be eated to a lesser degree than in an ordinary hot air furnace, and' that a greater volume of mildly heated air will be supplied, giving warmth and comfort to the rooms or apartments of the dwelling without parching the air and d'epriving it of its oxygen. It will also be seen that the degree to 'which the air is heated may be regulated by using either the direct lor indirect outlet for the products, so that the action of the furnace may be varied according tovariations in climatic conditions at different times.

In Figs. 7 and 8 of the drawings, I have showna modification in which the air conducting tubes 14* are crossed to give a still larger area of heating surface, the receiving openings therefor inthe top and bott'om headers bein staggered in arrangement to rovide for t eir pro er disposition, as will e readily understood In Fig. 6 of the drawin s, I have shown another modification in w ich the air conducting tubes 14" are of approximately half the length of the conducting tubes 14 and formed in effect of half sections thereof, providing comparatively short tubes which may be employed when it is required to make the furnace relatively short to fit within a lowceilinged room or shallow cellar. In other respects the construction of the furnace is the same except as to the shortening of the inner and outer casings, as will be readily understood.

Having thus described my invention, I claim In a deviceof the character described, the combination of an outer casing, an inner casing, said inner casin provided with a horizontal header at its ower portion,two sets of vertical air heating tubes communieating at their lower ends with s aid header and extending through said inner casing, and a cover for said outer casing having the form of two gable roofs, arranged side by 15 side and forming hot air receiving and distributing chambers with which said sets of air heatlng tubes respectively communicate, each roof being formed with air discharge o enings in each of its sides, the meeting e ges of said roofs tending to maintain the body o air heated by one set of tubes separated from the body of air heated by the other set of tubes.

In testimony whereof I aix my signature in presence of two Witnesses.

ALBERT R. LEGGETT.

Witnesses:

JOSEPH J. JENNINGB, A. Emmi: Imeenfrr. 

